Agitator for gyratory mills



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Filed Dec. 1924 2 Sheets-Sheet 1 Dec. 15, 1925- 1.565.281

W. T. M NINCH AGITATOR FOR GYRATORY HILLS Filed l 1924 2 Shuts-Sheet 2 Patented Dec. 15, 1925.

UNITED STATES PATENT OFFICE.

WILLIAM THOMAS MCITINCH, OF CHICAGO HEIGHTS, ILLINOIS, ASSIG-NOR TO AMERL CAN MANGANESE STEEL COT/IPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF MAINE.

AGrI'IATOIL FOR GYBATORY MILLS.

Application filed December 1, 1924. Serial no. 753,018.

To all whom it may concern:

Be it known that I, WILLIAM 'I. Mo- NINCH, a citizen of the United States, residing at Chicago Heights, in the county of Cook and State of Illinois, have invented certain new and use Improvements in Agitators for Gyratory Mills, of Which the following is a specification.

This invention relates to mills intended primarily for crushing mineral substances, such as ore, cement clinker, and the like, and which embody in their organization a runner or roll adapted to travel in an orbital path, as by mounting it upon a gyratory shaft, and at the same time rotate about its own axis and thus traverse the surface of a stationary ring against which it presses by centrifugalrs-force. In mills of this kind it is important to have agitators to keep the material stirred up and moving toward the crushing surfaces, and it has been proposed to locate such agitators upon the roll of the mill at a radial distance from its axis of rotation so that the agitators traverse a complex path influenced jointly by rotation of the roll and the orbital movement of the roll.

The present invention has for its object to provide an improved construction of agitator to be located upon the roll of a mill of the kind described, in a manner to be readily replaceable whenever the agitator wears out; also to provide a construction of roll and agitator which will adapt the latter to be mounted upon the former through the medium of its own attaching means (preferably a tap bolt or the like). Accordingly, one feature of the invention consists in constructing the agitator with a seating portion that enters a recess in the roll and thus interlocks with the roll in the plane of travel, and relieves its securing bolt largely of transverse strains; also in constructing the roll of a rim portion and a hub portion and with the hub portion consisting of two members, at least one of which is, and preferably both of them are, fitted to the rim portion through means of conic surfaces so that a tight fit is insured by drawing the hub members together in the direction of the axis of rotation; also in constructing the roll with its portion or portions to which the agitators are attached, of a different quality of metal from that of which. the rim or grinding portion is composed, thereby permitting more convenient tapping to receive the securing bolts and at the same time permitting the portion of the roll which receives the great est wear to be made of material more appropriate thereto; and still another feature consists in constructing the agitator in the form of a toe or clawhaving its forward face inclined, concaved, or otherwise designed to displace the material in which it works, and with a recess in rear of said forward portion that receives the head of the securing bolt or the nut thereon by means of which the agitator is secured in position.

In order that the invention may be fully understood, the preferred embodiment of the agitator, together with two different construction of roll adapted to receive the same, is illustrated in the accompanying drawings, in which Figures 1 and 2 are, respectively, an axial section and a bottom plan view of one construction of roll, having agitators embodying the subject of the present invention mounted thereon.

Figures 3 and 4- are views similar-to Figures 1 and 2 showing a modified construction of roll with the agitator of Figures 1 and 2 applied thereto; and

Figure 5 is a sectional detail view of the agitator employed in Figures 1 to 4.

rim A and drawn together by bolts I).

The rim member A will. preferably be made of material appropriate to the service which the roll is to render, for instance, manganese steel, which is especially adapted to withstand. wear, but the hub members 13 and G, and particularly the member 0, will preferably be made of carbon steel, for reasons of economy with respect to both the cost of production and durability in use. Member C is made of carbon steel for the further reason that it is easier to mount agitators upon a hub member of that kind than if made of manganese steel.

E represents agitators to be mounted upon the under surface of the roll, in such numbers as may be required, for instance, three agitators upon each roll, and these agitators are made in the form of a claw or plow having a concaved or forwardly and downwardly inclined front surface developing a toe 6; also a seating base 6, and walls 6 beneath the base and in rear of the toe 6; providing a housing to protect the means through which the agitator is secured to the roll; and in order to secure these agitators in position, the hub member C is provided with recesses c that receive the seating base 6, and tap screws f, or bolts or the like, are mounted in the hub member C in position to extend through the seating bases 0 in position to receive nuts or heads within the recesses 0. By this construction the agitators E can be very readily replaced when worn, and their securing means are thoroughly protected against destruction by contact with the material upon which the roll is working. Seating base a is non-circular in section, so that the toe e is always presented in the direction of travel.

According to Figures 2 and 3, the working rim A has a portion of the hub C formed integrally therewith, the hub portion B alone being made separate and fitted within the rim by means of conic surfaces; and in order that the agitators E may be replaceably mounted with the same facility as described in connection with Figures 1 and 2, the hub portion C, made integrally with the rim A and of manganese steel, will be cast with recesses C in which are fitted carbon steel plu s g to receive the tap screws f which secure the agitators E, precisely as described in connection with Figures 1 and 2. Agitators E are well de signed for production from manganese steel by the process of casting and tempering, their housings e and bores e for accommodation of the tap screws being readily formed therein by coring.

I claim:

1. In a mill having a roll, agitators mounted upon the roll in position to encounter material to be ground; said agitators being constructed with a substantially solid forward portion and with a protecting recess in rear of said forward portion, and having means securing them to the roll, located in said recess.

2. An agitator for the grinding roll of a mill, constructed with a seating base and a solid working portion forward of said base, and a protecting recess beneath said base and in rear of said solid portion affording a housing for means for securing said agitator to the roll.

3. In an agitator for the grinding roll of a mill, a seating base constructed with a reduced portion adapted to seat within a recess in the roll, a solid forwardly presented toe, and a recess beneath said base and in rear of said toe affording a protecting housing for means for securing the agitator to the roll.

4:. In combination with the roll of a grinding mill, having a recess, an agitator constructed with a base seating against the roll and having a reduced portion entering said recess; said recess and reduced portion being of non-circular form. to resist rotation of the agitator upon the roll; and said agitator having a solid forwardly presented portion and a recess beneath its seating base and in rear of said solid portion, said recess being adapted to receive means for securing the agitator to the roll.

5. An agitator for the roll of grinding mill, comprising a seating base adapted to receive means for attaching the agitator to the roll, a downwardly and forwardly extending toe through which the agitator cncounters the material when in use, and side walls extending downwardly from said base and rearwardly from said toe providing a housing for protecting the means by which the agitator is secured to the roll.

Signed at Chicago Heights, Illinois, this 25th day of November, 1924:.

IVILLIAM THOMAS MTCNINCH. 

